It's not an aircraft going down, it's just a big model with nobody in it. There is no need to make such a fuss about it.
The Americans laughed with bravado when they shot down a motionless balloon, now it's their turn to lose some costly device.
Important thing is that those long-range drones - which they have been flying without authoristation over countless countries - are now proved to be vulnerable.
There is nothing unprofesssionnal in this story, actually I find it quite smart, like the Spitfires unsettling the V1s with their wingtips in 1944.